Abstract
The aims of the present study were to investigate in brain of adult rats (1) whether exercise-induced activation of brain-derived neurotrophic factor (BDNF)/tropomyosin-related kinase B (TrkB) pathway is dependent on exercise intensity modality and (2) whether exercise-induced improvement of memory is proportional to this pathway activation. Wistar rats were subjected to low (12 m/min) or high (18 m/min) exercise intensity on horizontal treadmill (30 min/day, 7 consecutive days) that corresponds to ~ 40 and 70% of maximal aerobic speed, respectively. Animals treated with scopolamine to induce memory impairment were subjected to novel object recognition test to assess potential improvement in cognitive function. Expressions of BDNF, phosphorylated TrkB receptors, synaptophysin (a marker of synaptogenesis), c-fos (a neuronal activity marker) and phosphorylated endothelial nitric oxide synthase (a cerebral blood flow marker) were measured in prefrontal cortex and hippocampus of different groups of rats. In terms of cognition, our data reported that only the most intense exercise improves memory performance. Our data also revealed that BDNF pathway is dependent on intensity modality of exercise with a gradual effect in hippocampus whereas only the highest intensity leads to this pathway activation in prefrontal cortex. Our study revealed that memory improvement through BDNF pathway activation is dependent on exercise intensity. While reporting that our protocol is sufficient to improve cognition in animals with impaired memory, our data suggest that prefrontal cortex is possibly a more suitable structure than hippocampus when neuroplastic markers are used to mirror potential improvement in memory performance.
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Acknowledgements
The authors are grateful to Mrs. Jennifer Jones for assistance with behavioral test realization and data analysis, and finally Dr. Claire Cachia for help with statistical analysis of behavioral data.
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Cefis, M., Prigent-Tessier, A., Quirié, A. et al. The effect of exercise on memory and BDNF signaling is dependent on intensity. Brain Struct Funct 224, 1975–1985 (2019). https://doi.org/10.1007/s00429-019-01889-7
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DOI: https://doi.org/10.1007/s00429-019-01889-7